Of or pertaining to an orbit. J. D. Forbes. [1913 Webster]
Orbital index(Anat.), in the skull, the ratio of the vertical height to the transverse width of the orbit, which is taken as the standard, equal to 100.
orbital, adj. & n.
--adj.
1 Anat., Astron., & Physics of an orbit or orbits.
2 (of a road) passing round the outside of a town.
--n. Physics a state or function representing the possible motion of an electron round an atomic nucleus.
Idiom
orbital sander a sander having a circular and not oscillating motion.